:root{--color-background: #FAF9F6;--color-surface: #FFFFFF;--color-card-bg: #F5F4F2;--color-text-primary: #1A1A1A;--color-text-secondary: #6B6B6B;--color-text-muted: #A3A3A3;--color-accent: #D97757;--color-accent-hover: #C4694B;--color-border: #E8E6E3;--color-video-bg: #1C1C1C;--font-serif: "Crimson Pro", "Songti SC", "Noto Serif SC", Georgia, serif;--font-sans: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "DM Mono", "Consolas", monospace;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px rgba(0, 0, 0, .07)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background-color:var(--color-background);color:var(--color-text-primary);line-height:1.6;min-height:100vh}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}input{font-family:inherit;border:none;outline:none}.container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-lg)}.home{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-xl)}.home__logo{font-family:var(--font-serif);font-size:56px;font-weight:600;color:var(--color-text-primary);margin-bottom:var(--spacing-sm)}.home__tagline{font-size:16px;color:var(--color-text-secondary);margin-bottom:var(--spacing-lg)}.language-switch{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-xl);font-size:14px}.language-switch__btn{padding:var(--spacing-xs) var(--spacing-sm);color:var(--color-text-muted);transition:color .2s ease}.language-switch__btn:hover{color:var(--color-text-secondary)}.language-switch__btn.active{color:var(--color-accent);font-weight:500}.language-switch__divider{color:var(--color-border)}.url-input-container{width:100%;max-width:560px;margin-bottom:var(--spacing-lg)}.url-input{width:100%;height:56px;padding:0 var(--spacing-lg);font-size:15px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);transition:border-color .2s ease,box-shadow .2s ease}.url-input::placeholder{color:var(--color-text-muted)}.url-input:focus{border-color:var(--color-accent);box-shadow:0 0 0 3px #d977571a}.url-input.loading{border-color:var(--color-accent);border-width:2px}.generate-btn{width:160px;height:52px;background:var(--color-accent);color:#fff;font-size:16px;font-weight:500;border-radius:var(--radius-md);transition:background-color .2s ease,transform .1s ease}.generate-btn:hover:not(:disabled){background:var(--color-accent-hover)}.generate-btn:active:not(:disabled){transform:scale(.98)}.generate-btn:disabled{opacity:.7;cursor:not-allowed}.loading-container{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-md);margin-top:var(--spacing-lg)}.loading-dots{display:flex;gap:6px}.loading-dots__dot{width:8px;height:8px;border-radius:50%;background:var(--color-accent);animation:bounce 1.4s infinite ease-in-out}.loading-dots__dot:nth-child(1){animation-delay:-.32s}.loading-dots__dot:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(.6);opacity:.4}40%{transform:scale(1);opacity:1}}.loading-status{font-size:14px;color:var(--color-text-secondary)}.home__caption{margin-top:var(--spacing-lg);font-size:13px;color:var(--color-text-muted)}.result{min-height:100vh;display:flex;flex-direction:column}.header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md) var(--spacing-lg);background:var(--color-surface);border-bottom:1px solid var(--color-border)}.header__logo{font-family:var(--font-serif);font-size:24px;font-weight:600}.header__actions{display:flex;gap:var(--spacing-md)}.header__btn{padding:var(--spacing-sm) var(--spacing-md);font-size:14px;font-weight:500;border-radius:var(--radius-sm);transition:all .2s ease}.header__btn--secondary{color:var(--color-text-secondary);border:1px solid var(--color-border)}.header__btn--secondary:hover{background:var(--color-card-bg)}.header__btn--primary{background:var(--color-accent);color:#fff}.header__btn--primary:hover{background:var(--color-accent-hover)}.result__main{flex:1;display:flex;gap:0;padding:var(--spacing-lg)}.result__player{width:52%;padding-right:var(--spacing-lg)}.result__notes{width:48%;overflow-y:auto;max-height:calc(100vh - 80px)}.video-player{position:relative;width:100%;background:var(--color-video-bg);border-radius:var(--radius-md);overflow:hidden}.video-player__wrapper{position:relative;padding-bottom:56.25%}.video-player__iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}.video-player__info{padding:var(--spacing-md);background:var(--color-surface);border:1px solid var(--color-border);border-top:none;border-radius:0 0 var(--radius-md) var(--radius-md)}.video-player__title{font-size:17px;font-weight:600;margin-bottom:var(--spacing-xs)}.video-player__meta{font-size:13px;color:var(--color-text-muted)}.shownotes{padding-left:var(--spacing-lg)}.shownotes__title{font-size:20px;font-weight:700;margin-bottom:var(--spacing-lg)}.summary-card{background:var(--color-card-bg);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin-bottom:var(--spacing-xl)}.summary-card__label{font-size:14px;font-weight:600;color:var(--color-text-secondary);margin-bottom:var(--spacing-md)}.summary-card__content{font-size:15px;line-height:1.7;color:var(--color-text-primary)}.timeline__title{font-size:18px;font-weight:600;margin-bottom:var(--spacing-lg);padding-bottom:var(--spacing-md);border-bottom:1px solid var(--color-border)}.timeline-item{padding:var(--spacing-md) 0;border-bottom:1px solid var(--color-border)}.timeline-item:last-child{border-bottom:none}.timeline-item__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-sm)}.timeline-item__time{font-family:var(--font-mono);font-size:14px;color:var(--color-accent);cursor:pointer;transition:text-decoration .2s ease}.timeline-item__time:hover{text-decoration:underline}.timeline-item__title{font-size:15px;font-weight:600;flex:1;margin-left:var(--spacing-md)}.timeline-item__expand{font-size:13px;color:var(--color-text-muted)}.timeline-item__content{display:flex;gap:var(--spacing-md);margin-top:var(--spacing-sm)}.timeline-item__thumbnail{width:120px;height:68px;background:var(--color-video-bg);border-radius:var(--radius-sm);flex-shrink:0;overflow:hidden}.timeline-item__thumbnail img{width:100%;height:100%;object-fit:cover}.timeline-item__description{font-size:14px;color:var(--color-text-secondary);line-height:1.6}.toc-btn{position:fixed;bottom:var(--spacing-xl);right:var(--spacing-xl);width:48px;height:48px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);transition:all .2s ease}.toc-btn:hover{background:var(--color-card-bg);transform:scale(1.05)}.shownotes__loading{padding:var(--spacing-lg)}.loading-skeleton{margin-bottom:var(--spacing-lg)}.skeleton-line{height:16px;background:linear-gradient(90deg,var(--color-card-bg) 25%,#e8e6e3 50%,var(--color-card-bg) 75%);background-size:200% 100%;border-radius:4px;margin-bottom:var(--spacing-sm);animation:shimmer 1.5s infinite}.skeleton-title{width:40%;height:20px;margin-bottom:var(--spacing-md)}.skeleton-text{width:100%}.skeleton-text.short{width:60%}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.loading-hint{font-size:14px;color:var(--color-text-muted);text-align:center;animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:.6}50%{opacity:1}}.streaming-indicator{padding:var(--spacing-sm) 0}.streaming-cursor{display:inline-block;color:var(--color-accent);animation:blink 1s step-end infinite}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}.error-message{padding:var(--spacing-lg);background:#fef2f2;border:1px solid #FECACA;border-radius:var(--radius-md);color:#991b1b;font-size:14px;text-align:center}.markdown-content h2{font-size:18px;font-weight:600;margin-top:var(--spacing-lg);margin-bottom:var(--spacing-md)}.markdown-content p{margin-bottom:var(--spacing-md)}.markdown-content ul{padding-left:var(--spacing-lg);margin-bottom:var(--spacing-md)}.markdown-content li{margin-bottom:var(--spacing-sm)}.markdown-content strong{font-weight:600}@media (max-width: 768px){.home__logo{font-size:40px}.url-input-container{max-width:100%}.result__main{flex-direction:column}.result__player,.result__notes{width:100%;padding-right:0}.result__player{margin-bottom:var(--spacing-xl)}.shownotes{padding-left:0}}